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Partial discharge is a symptom of the insulation condition of covered conductor lines and is effective for their predictive maintenance. Accordingly, there is increasing interest in identifying the traveling direction of partial discharge pulses in covered conductor lines in an effort to assist the location of the partial discharge source. In this article, a simple, convenient, and inexpensive sensor is designed to identify the traveling direction of partial discharge pulses. This improved sensor mainly consists of a pulse current transducer (an air-cored Rogowski coil) and a voltage coupler (two copper foil electrodes). The feasibility of this sensor is proven by software simulation and finally confirmed by both a pulse injection experiment and a high-voltage partial discharge test on a 10-kV cross linked polyethylene (XLPE) covered conductor.

Assessment model for the potential of clean energy development should be proposed because which is important for more efficient clean energy development. Introduce the mutation theory into the assessment of the development potential of clean energy and establish a model for the evaluation of the development potential of clean energy. Through the example analysis, the validity of the established evaluation index of the potential of clean energy development is verified, and the validity of the model of mutation evaluation of the potential of clean energy development is verified.

This letter presents a double-side measuring method for online partial-discharge (PD) detection and location in covered conductor (CC) lines. To synchronize both PD sampling units mounted on two separate sides, a novel time alignment technique is proposed and implemented using the combination of a pulse injector and a pulse detector. A laboratory experiment on a 10-kV CC line was conducted to verify the feasibility of this technique.

Efficiency evaluation index system should be proposed because which is important for more efficient operation of smart distribution grid. The status of distribution network and the challenges of smart distribution grid are analyzed in this paper. The construction ideas of efficiency evaluation index system are proposed. On this basis, the criteria layer, the performance layer and the application layer of efficiency evaluation index system are proposed based on system analysis theory combination with AHP method. Theoretical basis for construction evaluation index are elaborated in this paper.